In a document that is read only or open to comments only, an exception
that starts a paragraph puts its start marker at the line start. Home,
Left, Right from the line above and Down into an empty line leave the
caret before that marker, outside the exception, so Enter and typing
there were refused. An editable line right after a protected line could
not be broken or typed into from its start. The same happened at the end
of a line that an exception ends, where End leaves the caret after the
end marker.
Typing now moves a caret right before the start of an exception the
author may edit to just inside it, and one right after its end back
inside it, as Document::typing_pos already does for the markers of a
block-level content control.
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